Gas booster type coil pipe plate forming method

Abstract

The invention provides a gas booster type coil pipe plate forming method, which belongs to the field of coil pipe plate processing, and comprises the following steps: processing a base plate, a runner plate and a runner groove, spraying a solder resist on a non-diffusion area of the runner plate, sealing the runner plate and the base plate through argon arc welding to form a prefabricated plate, manufacturing an air bag, and installing the prefabricated plate and the air bag in a mold from bottom to top; the prefabricated plate is heated to a preset temperature; welding protective gas is filled into the air bag to reach a first preset pressure, the pressure is released to a second preset pressure after the pressure is maintained for a first preset time, and then the pressure is maintained; filling welding protective gas into a runner groove of the prefabricated slab to a third preset pressure, maintaining the pressure for a second preset time, releasing the pressure to a fourth preset pressure, and maintaining the pressure; the prefabricated slab is inspected; and machining the prefabricated plate to form the coil pipe plate. The problem that a large-area coil pipe plate is difficult to machine is solved. The technical effect is that the connection of the large-size coil pipe plates is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of disc tube plate processing, and particularly relates to a gas pressurization type disc tube plate forming method. BACKGROUND

[0002] A superconducting magnet can generate a strong magnetic field, and when applied to a linear motor system, the strong magnetic field can be converted into strong propulsion, which is widely used in high-speed maglev trains, electromagnetic launching and other application scenarios. However, in the linear motor system, the superconducting magnet needs to be as close as possible to the ground stator module, so the superconducting magnet has strict size limitations. The titanium alloy disc tube plate, as an important part of the superconducting magnet refrigeration system, has a low density of titanium alloy material, and the integrated structure of the tube plate can reduce the thickness size of the superconducting magnet as much as possible while ensuring the heat exchange efficiency.

[0003] The titanium alloy disc tube plate is composed of a substrate and a disc tube, as shown in Figures 1 to 5 The substrate is used as a cover of the inner Dewar of the superconducting magnet, so that the refrigerant is separated from the medium in the inner Dewar of the superconducting magnet; the disc tube is internally filled with flowing refrigerant, and the disc tube wall separates the refrigerant from the vacuum thermal insulation layer.

[0004] At present, the connection process of the substrate and the disc tube mainly includes argon arc welding, electron beam welding, 3D printing and diffusion welding. However, when processing a large-area disc tube plate, argon arc welding can only realize the fusion of the outer side of the disc tube, and the internal area is not fused, which leads to a sharp drop in pressure-bearing capacity; electron beam welding needs to be welded piece by piece, which is time-consuming, has large thermal deformation and high cost; 3D printing is difficult to process large-size parts due to the limitation of equipment size, and vertical printing also faces high cost and high cracking risk; and the conventional diffusion welding has strict requirements on the flatness of the welded parts, and the mechanical processing of large-size plates cannot guarantee the flatness, which makes the connection quality uncontrollable.

[0005] In summary, the existing connection process of the substrate and the disc tube has defects such as processing difficulty, uncontrollable connection quality, easy deformation and weak pressure-bearing capacity when processing and forming a large-area disc tube plate. SUMMARY

[0006] The present application provides a gas pressurization type disc tube plate forming method to solve the defects such as processing difficulty, uncontrollable connection quality, easy deformation and weak pressure-bearing capacity of the existing connection process when processing a large-area disc tube plate, realize the connection of a large-size titanium alloy disc tube plate, and avoid the problems such as large deformation, poor air tightness and low pressure-bearing capacity.

[0007] The present application provides a gas pressurization type disc tube plate forming method, which comprises the following steps:

[0008] The prefabricated plate is prefabricated, a substrate and a runner plate are processed, a runner groove is formed on the runner plate, a flux is sprayed on a non-diffusion area of the runner plate, and the runner plate and the substrate are sealed by argon arc welding to form the prefabricated plate.

[0009] The prefabricated plate is heated to a preset temperature.

[0010] The prefabricated plate is heated to a preset temperature.

[0011] The prefabricated plate is heated to a preset temperature.

[0012] The prefabricated plate is heated to a preset temperature.

[0013] The prefabricated plate is heated to a preset temperature.

[0014] The prefabricated plate is heated to a preset temperature.

[0015] In addition, the gas pressurization type coil plate forming method according to the present application can further have the following additional technical features.

[0016] In some embodiments of the present application, heating the prefabricated plate to a preset temperature comprises:

[0017] The prefabricated plate and the air bag are vacuumized.

[0018] The temperature of the prefabricated plate is heated to 920-940 DEG C at a first preset speed.

[0019] In some embodiments of the present application, the welding protective gas is filled into the air bag to a first preset pressure, which comprises:

[0020] The welding protective gas is filled into the air bag to 1 MPa at a second preset speed, and pressure is maintained for a first preset time.

[0021] The welding protective gas is filled into the air bag to 1.5 MPa at a third preset speed, and pressure is maintained for a second preset time.

[0022] The welding protective gas is filled into the air bag to 1.8 MPa at a fourth preset speed, and pressure is maintained for a third preset time.

[0023] The welding protective gas is filled into the air bag to 2 MPa at a fifth preset speed.

[0024] In some embodiments of the present application, the welding protective gas is filled into the runner groove of the prefabricated plate to a third preset pressure, which comprises:

[0025] The flow channel groove of the prefabricated plate is filled with the welding protective gas at a sixth preset speed to pressurize to 1 MPa.

[0026] In some embodiments of the present application, the method further comprises welding a vacuum pipeline at the outlet of the flow channel groove before the air bag is made.

[0027] In some embodiments of the present application, the air bag comprises a backing plate, a support strip and a sealing plate, the support strip is installed between the sealing plate and the backing plate, and the support strip is provided with a gas hole.

[0028] In some embodiments of the present application, the air bag further comprises a filling pipeline, which is inserted into the gas hole.

[0029] In some embodiments of the present application, the method of making the air bag comprises:

[0030] The contact surface between the support strip and the backing plate and the contact surface between the support strip and the sealing plate are sprayed with a resistance soldering agent;

[0031] The support strip and the sealing plate and the support strip and the backing plate are sealed by argon arc welding;

[0032] The filling pipeline is butted at the gas hole and welded with the sealing plate, the backing plate and the support strip.

[0033] In some embodiments of the present application, the method of inspecting the prefabricated plate comprises:

[0034] A hole is drilled in the non-diffusion area of the flow channel plate as a detection point;

[0035] Inert gas is filled into the prefabricated plate to test the pressure-bearing performance of the prefabricated plate.

[0036] In some embodiments of the present application, the first preset time is 2h, the second preset pressure is 0.1 MPa, the second preset time is 2h, and the fourth preset pressure is 0.1 MPa.

[0037] In summary, the present application has the following beneficial technical effects: the process sequence of first diffusion bonding and then machining the flow channel shape is formed by the method of prefabricated plate heating, air bag pressurization and loading, and prefabricated plate pressurization and back blowing after machining, which can effectively avoid the deformation caused by a large amount of machining, and significantly reduce the influence of the flatness difference of the flow channel plate on the diffusion bonding quality.

[0038] The setting of the prefabricated plate formed by the argon arc welding sealing of the flow channel plate and the base plate forms a pre-treatment process of whole plate welding edge sealing, which can form a vacuum cavity independently inside the product and realize separate vacuumization to prevent oxidation, so that the process does not need to use a special vacuum diffusion welding furnace, and only a conventional heat treatment furnace with pressure clamping function can realize diffusion bonding, which not only reduces the cost of the diffusion bonding process, but also breaks through the size limitation of the existing vacuum diffusion welding furnace on the size of the coil plate product.

[0039] The gas pressurized diffusion bonding process using the airbag pressurized loading is more uniform in force than the conventional mechanical pressurized method, so even if the substrate and the flow channel plate are not locally attached, the flow channel plate will deform at each point with the gas load after the titanium alloy material reaches the superplastic temperature, which can achieve the effect of reshaping and attaching, ensure the diffusion bonding quality, and effectively solve the influence of the poor flatness of the machined substrate and flow channel plate on the diffusion bonding quality, and is suitable for the forming and manufacturing of large area coil plate.

[0040] In summary, the method can realize the forming and machining of large size titanium alloy coil plate and avoid the problems of large deformation, poor air tightness and low pressure bearing capacity, realize the inter-wall heat exchange of low temperature pressure medium under the limitation of size, and effectively reduce the difficulty of diffusion welding of large size TC4 coil plate and improve the product qualification rate. BRIEF DESCRIPTION OF DRAWINGS

[0041] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to be limiting in any respect. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views, wherein:

[0042] Figure 1 A perspective view of a coil plate according to the gas pressurized coil plate forming method of some embodiments of the application is schematically shown.

[0043] Figure 2 A top view of a coil plate according to the gas pressurized coil plate forming method of some embodiments of the application is schematically shown.

[0044] Figure 3 A cross-sectional view of a coil plate according to the gas pressurized coil plate forming method of some embodiments of the application is schematically shown.

[0045] Figure 4 A side view of a coil plate according to the gas pressurized coil plate forming method of some embodiments of the application is schematically shown.

[0046] Figure 5 A partial enlarged view of a side view of a coil plate according to the gas pressurized coil plate forming method of some embodiments of the application is schematically shown.

[0047] Figure 6 An exploded view of a perspective view of a preform plate according to the gas pressurized coil plate forming method of some embodiments of the application is schematically shown.

[0048] Figure 7 A perspective view of a preform plate of a gas pressurized coil plate forming method according to some embodiments of the present application is schematically shown.

[0049] Figure 8 A cross-sectional view of a preform plate of a gas pressurized coil plate forming method according to some embodiments of the present application is schematically shown.

[0050] Figure 9 An exploded view of a perspective view of a bladder of a gas pressurized coil plate forming method according to some embodiments of the present application is schematically shown.

[0051] Figure 10 A perspective view of a bladder of a gas pressurized coil plate forming method according to some embodiments of the present application is schematically shown.

[0052] Figure 11 A cross-sectional view of a preform plate of a gas pressurized coil plate forming method according to some embodiments of the present application is schematically shown.

[0053] Figure 12 A temperature change graph of a preform plate heating process of a gas pressurized coil plate forming method according to some embodiments of the present application is schematically shown.

[0054] Figure 13 A pressure change graph in a bladder of a bladder pressurization loading process of a gas pressurized coil plate forming method according to some embodiments of the present application is schematically shown.

[0055] Figure 14 A preform plate pressure change graph of a preform plate pressurization backblowing process of a gas pressurized coil plate forming method according to some embodiments of the present application is schematically shown.

[0056] Figure 15 A flowchart of a gas pressurized coil plate forming method according to some embodiments of the present application is schematically shown.

[0057] Reference numerals:

[0058] 1. Base plate, 2. Coil, 3. Vacuum line, 4. Runner plate, 5. Runner groove, 6. Non-diffusion area, 7. Inflation line, 8. Sealing plate, 9. Spacer plate, 10. Support bar, 11. Air hole, 12. Lower mold, 13. Upper mold. DETAILED DESCRIPTION

[0059] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While example embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0060] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and the like are to be construed to be inclusive (i.e., to include both instances of open ended terms and instances of terms limiting to a specific number) unless otherwise indicated as otherwise limited by context. The methods described herein can be implemented as a method, an apparatus, a system, a computer program product, or any combination thereof.

[0061] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to differentiate one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0062] For the sake of description, spatial relative terms can be used herein for describing the relationship between one element or feature to another element or feature as shown in the drawings, such as "inner", "outer", "inside", "outside", "lower", "below", "upper", "above", and the like. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, an element described as "below" or "under" another element or feature would then be oriented "above" or "over" the other element or feature. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0063] As shown in the drawings, according to the embodiment of the first aspect of the present application, a gas pressurized coil plate forming method is provided, comprising the following steps: Figures 6 to 15

[0064] Preparation of the pre-plate, processing the base plate 1 and the runner plate 4, and opening the runner groove 5 on the runner plate 4, spraying the solder resist on the non-diffusion area 6 of the runner plate 4, and sealing the runner plate 4 and the base plate 1 by argon arc welding to form the pre-plate;

[0065] Layered die assembly, making the air bag and installing the pre-plate and the air bag in the mold from bottom to top;

[0066] Pre-plate heating, heating the pre-plate to a preset temperature;

[0067] Air bag pressurization and loading, filling the welding protective gas into the air bag to a first preset pressure, maintaining the pressure for a first preset time, and then releasing the pressure to a second preset pressure and maintaining the pressure;

[0068] Pre-plate pressurization and back blowing, filling the welding protective gas into the runner groove 5 of the pre-plate to a third preset pressure, maintaining the pressure for a second preset time, and then releasing the pressure of the pre-plate to a fourth preset pressure and maintaining the pressure;

[0069] Inspection of the pre-plate;

[0070] Machining, machining the pre-plate to form the coil plate, and completing the machining.

[0071] In the above embodiment, it should be noted that the welding protective gas can be a mixture of argon and helium gas, or helium gas, or argon gas. Preferably, the welding protective gas is argon.

[0072] After spraying the solder resist on the non-diffusion area 6 of the runner plate 4, before sealing the runner plate 4 and the base plate 1 by argon arc welding to form the pre-plate, it further comprises: after the solder resist solidifies, the runner plate 4 and the base plate 1 are correspondingly attached and overlapped.​

[0073] The mechanical processing of the preform plate forms the coil plate, at this time the flow channel plate 4 is the coil 2 of the coil plate, and the base plate 1 is the base plate 1 of the coil plate.

[0074] During the pre-preparation process of the preform plate, the length and width of the processed base plate 1 are greater than the length and width of the base plate 1 of the coil plate, and the length and width of the flow channel plate 4 are greater than the length and width of the coil 2 of the coil plate; the argon arc welding sealing of the flow channel plate 4 and the base plate 1 to form the preform plate includes: the argon arc welding sealing of the flow channel plate 4 and the base plate 1 around the non-diffusion area 6 by argon arc welding to form the preform plate; the mold includes an upper mold 13 and a lower mold 12, the preform plate and the air bag are installed between the upper mold 13 and the lower mold 12 from bottom to top, the lower surface of the upper mold 13 and the upper surface of the lower mold 12 are both flat, the lower mold 12 can be a flat plate structure fixed on the ground or on an existing support frame, and the upper mold 13 can also be a flat plate structure fixed on an existing support frame, and the upper mold 13 is located directly above the lower mold 12; the upper mold 13 can be an existing upper clamping plate, and the lower mold 12 can be an existing lower clamping plate structure, that is, the mold can be a structure composed of upper and lower clamping plates, and the specific structure is not discussed here.

[0075] The first preset pressure can be a pressure between 2 MPa and 2.5 MPa, and the first preset time can be a time greater than or equal to 2 h, which can be between 2 h and 3 h.

[0076] The third preset pressure can be a pressure between 1 MPa and 1.5 MPa, and the second preset time can be a time greater than or equal to 2 h, which can be between 2 h and 3 h.

[0077] The base plate 1 and the flow channel plate 4 can both be made of TC4 titanium alloy material.

[0078] After the preform plate is inspected and qualified, before the mechanical processing of the preform plate to form the coil plate, it further includes: naturally cooling the preform plate to 500℃, and avoiding large-area contact with greenhouse objects during the cooling process to prevent thermal stress distribution from being uneven and causing the preform plate to warp and deform.

[0079] The above embodiment achieves the technical effect that: the method of preform plate heating, air bag pressurization loading, and preform plate pressurization backblowing before mechanical processing forms a process sequence of first diffusion bonding and then mechanical processing of the flow channel shape, which can effectively avoid processing deformation caused by a large amount of mechanical processing and significantly reduce the influence of the flatness difference of the flow channel plate 4 on the diffusion bonding quality.

[0080] By sealing the flow channel plate 4 with the substrate 1 by argon arc welding to form a prefabricated plate, a pretreatment process for welding and sealing the entire plate is formed. This allows the product to form an independent vacuum chamber, enabling separate vacuuming to prevent oxidation. Therefore, this process does not require a special vacuum diffusion welding furnace. A conventional heat treatment furnace with pressure clamping function is sufficient to achieve diffusion connection. This not only reduces the cost of the diffusion connection process but also breaks through the limitation of the size of the existing vacuum diffusion welding furnace on the size of the coiled tube board product.

[0081] The diffusion bonding process using gas-pressurized loading with airbags provides more uniform stress on the precast plate compared to conventional mechanical pressurization. Therefore, even if there is local non-adhesion between the substrate 1 and the flow channel plate 4, the flow channel plate 4 will deform under the gas load after the titanium alloy material reaches the superplastic temperature, thus achieving a shaping and bonding effect. This ensures the quality of the diffusion bonding and effectively solves the problem of the difference in the flatness of the mechanical processing between the substrate 1 and the flow channel plate 4 affecting the quality of the diffusion bonding. It is suitable for the molding and manufacturing of large-area coiled boards.

[0082] In summary, this method enables the forming and processing of large-size titanium alloy coils, avoiding problems such as large deformation, poor airtightness, and low pressure bearing capacity. It also achieves indirect heat exchange of low-temperature pressurized working fluid under limited size constraints. Furthermore, this method avoids the dependence of the diffusion welding process on a vacuum diffusion welding furnace, and also avoids substandard diffusion weld surface connection quality caused by unevenness in the machining process of the workpiece itself. This effectively reduces the difficulty of diffusion welding forming of large-size TC4 coils and improves the product qualification rate.

[0083] Optional, such as Figure 11 and Figure 12 As shown, heating the precast slab to a preset temperature includes:

[0084] Vacuum treatment was performed on the precast panels and airbags.

[0085] The temperature of the precast slab is heated to between 920°C and 940°C at a first preset speed.

[0086] In the above optional embodiments, it should be noted that the first preset speed can be 80℃ / h, 85℃ / h, 90℃ / h, 95℃ / h, or 100℃ / h; preferably, the first preset speed is 90℃ / h.

[0087] Specifically, the temperature of the precast slab is heated to between 920°C and 940°C at a first preset speed, including heating to 920°C to 940°C at a speed of 90°C / h. At this time, the first preset speed is 90°C / h and the preset temperature is between 920°C and 940°C. When the temperature of the precast slab is heated to between 920°C and 940°C, the temperature of the precast slab is maintained between 920°C and 940°C.

[0088] The beneficial effects of the above-mentioned optional embodiments are: through the setting of vacuumizing the prefabricated plate and the air bag, oxidation can be prevented, and the forming effect of the prefabricated plate is guaranteed; through the setting of heating the temperature of the prefabricated plate to 920-940℃, the interatomic bonding resistance of the titanium alloy can be effectively reduced, which helps to form a firm bond between the substrate 1 and the runner plate 4, improves the connection quality, promotes the full movement of atoms, reduces the interface pores, and enhances the strength and sealing performance of the connection area.

[0089] Optionally, as shown in Figure 11 and Figure 13 filling the welding protective gas into the air bag to a first preset pressure includes:

[0090] filling the welding protective gas into the air bag at a second preset speed to increase the pressure to 1 MPa, and maintaining the pressure for a first set time;

[0091] filling the welding protective gas into the air bag at a third preset speed to increase the pressure to 1.5 MPa, and maintaining the pressure for a second set time;

[0092] filling the welding protective gas into the air bag at a fourth preset speed to increase the pressure to 1.8 MPa, and maintaining the pressure for a third set time;

[0093] filling the welding protective gas into the air bag at a fifth preset speed to increase the pressure to 2 MPa.

[0094] In the above-mentioned optional embodiments, it should be noted that the second preset speed can be 0.05-0.15 MPa / min;

[0095] the third preset speed can be 0.05-0.15 MPa / min, and the first set time is between 8-12 min;

[0096] the fourth preset speed can be 0.03-0.08 MPa / min, and the second set time is between 8-12 min;

[0097] the fifth preset speed can be 0.03-0.07 MPa / min, and the third set time is between 8-12 min.

[0098] Specifically, filling the welding protective gas into the air bag to a first preset pressure includes:

[0099] filling the welding protective gas into the air bag at a speed of 0.1 MPa / min to increase the pressure to 1 MPa, and maintaining the pressure for 10 min;

[0100] increasing the pressure to 1.5 MPa at a speed of 0.1 MPa / min, and maintaining the pressure for 10 min;

[0101] Pressurize to 1.8 MPa at a rate of 0.05 MPa / min, and hold for 10 min;

[0102] Pressurize to 2 MPa at a rate of 0.05 MPa / min.

[0103] The beneficial effects of the above optional embodiments are that: by setting the welding protective gas to be filled into the air bag to the first preset pressure, the adhesion between the base plate 1 and the flow channel can be increased to enhance the connection effect; by setting the stage pressurization, the uneven distribution of the welding gas after one-time pressurization can be avoided, and the risk of the air bag weld being broken by pressure expansion can be reduced.

[0104] Optionally, as shown in Figure 11 and Figure 14 filling the welding protective gas into the flow channel groove 5 of the prefabricated plate to the third preset pressure includes:

[0105] filling the welding protective gas into the flow channel groove 5 of the prefabricated plate at a sixth preset speed to 1 MPa.

[0106] In the above optional embodiments, it should be noted that the sixth preset speed can be between 0.08 MPa / min and 0.12 MPa / min.

[0107] Specifically, filling the welding protective gas into the flow channel groove 5 of the prefabricated plate to the third preset pressure includes:

[0108] filling the welding protective gas into the flow channel groove 5 of the prefabricated plate at a rate of 0.1 MPa / min to 1 MPa; at this time, the third preset pressure is 1 MPa.

[0109] The beneficial effects of the above optional embodiments are that: by setting the welding protective gas to be filled into the flow channel groove 5 of the prefabricated plate to the third preset pressure, the flow channel groove 5 can be kept in a stable form, preventing internal oxygen from causing oxidation of the diffusion bonding surface at high temperatures, and avoiding the decline in sealing performance and pressure-bearing capacity due to oxidation of the bonding surface.

[0110] Optionally, as shown in Figure 6 and Figure 7 In the layering and molding step, before the air bag is made, it further includes: welding a vacuum pipeline 3 at the outlet of the flow channel groove 5.

[0111] In the above optional embodiments, it should be noted that the method of machining the prefabricated plate to form the coil plate is to use a cutting machine to cut off the vacuum pipeline 3, and then use a milling machine to machine the base plate 1 and the flow channel plate 4 to the size of the base plate 1 of the coil plate and the size of the coil 2 of the coil plate.

[0112] The beneficial effects of the above optional embodiments are that: by providing the vacuum pipeline 3, the convenience of vacuumizing the prefabricated plate can be increased.

[0113] Optionally, as Figures 9 to 11 shown, the airbag includes a backing plate 9, a support bar 10 and a sealing plate 8. The support bar 10 is installed between the sealing plate 8 and the backing plate 9, and air holes 11 are formed in the support bar 10.

[0114] In the above optional embodiment, it should be noted that the shape of the support bar 10 is a rectangular frame structure in the shape of a "return" character; or the number of support bars 10 is four, and the four support bars 10 are connected end to end in sequence to form a rectangular frame structure. The four support bars 10 are all installed between the sealing plate 8 and the backing plate 9 to separate the backing plate 9 and the sealing plate 8, so that there is sufficient space between the backing plate 9 and the sealing plate 8 to facilitate gas pressurization; the thickness of the support bar 10 is relatively thin to achieve one-time welding while fusing the sealing plate 8, the backing plate 9 and the support bar 10.

[0115] Optionally, as Figures 9 to 11 shown, the airbag further includes an inflation pipeline 7, and the inflation pipeline 7 is inserted on the air hole 11.

[0116] Optionally, as Figure 2 and Figure 3 shown, manufacturing the airbag includes:

[0117] Spraying a welding inhibitor on the contact surface between the support bar 10 and the backing plate 9 and the contact surface between the support bar 10 and the sealing plate 8;

[0118] Performing argon arc welding sealing on the support bar 10 and the sealing plate 8 and the support bar 10 and the backing plate 9;

[0119] Connecting the inflation pipeline 7 at the air hole 11 and welding it with the sealing plate 8, the backing plate 9 and the support bar 10.

[0120] In the above optional embodiment, it should be noted that installing the prefabricated plate and the airbag in the mold from bottom to top includes: first installing the prefabricated plate on the lower mold 12, and then placing the airbag on the prefabricated plate and making the vacuum pipeline 3 of the prefabricated plate and the inflation pipeline 7 of the airbag face the same direction.

[0121] Performing vacuum treatment on the prefabricated plate and the airbag includes: both the vacuum pipeline 3 of the prefabricated plate and the inflation pipeline 7 of the airbag are connected to a vacuum unit, and the vacuum unit is used to perform vacuum treatment on the airbag and the prefabricated plate to prevent oxidation.

[0122] The beneficial effects of the above optional embodiment are: through the cooperation of the backing plate 9, the sealing plate 8 and the support bar 10, uniform pressure can be applied to the prefabricated plate, and the substrate 1 and the flow channel plate 4 can be completely adhered under the superplastic state, improving the connection quality between the substrate 1 and the flow channel plate 4 of the prefabricated plate.

[0123] Optionally, inspecting the prefabricated plate includes:

[0124] Drilling holes in the non-diffusion area 6 of the flow channel plate 4 as detection points;

[0125] Filling inert gas into the prefabricated plate to test the pressure-bearing performance of the prefabricated plate.

[0126] In the above optional embodiment, it should be noted that the way to fill inert gas into the prefabricated plate to test the pressure-bearing performance of the prefabricated plate is to fill inert gas into the prefabricated plate through the vacuum pipeline 3, spray leak detection liquid at the drilled hole, and observe whether the leak detection liquid bubbles to determine whether there is a gap in the connection area between the base plate 1 and the flow channel plate 4.

[0127] In actual application, the test results of the prefabricated plate are generally divided into three cases: if the pressure-bearing capacity and the air tightness are qualified, the next step is performed normally; if the pressure-bearing capacity is unqualified or serious gas leakage occurs, the secondary diffusion is performed again, and if it is still unqualified, oxidation is likely to occur inside, which needs to be scrapped; if the pressure-bearing capacity is qualified but there is small-scale gas leakage, the post-weld machining is performed normally, but after machining, the specific leakage point needs to be found and local argon arc welding is performed to repair the leakage.

[0128] The beneficial effect of the above optional embodiment is that the setting of the prefabricated plate can preliminarily determine whether the diffusion welding process is qualified, so as to avoid sending unqualified products with more serious problems to post-weld machining, which leads to that the flow channel 2 cannot be re-furnaced for secondary diffusion after machining.

[0129] Optionally, as shown in Figure 13 and Figure 14 , the first preset time is 2h, the second preset pressure is 0.1MPa, the second preset time is 2h, and the fourth preset pressure is 0.1MPa.

[0130] The beneficial effect of the above optional embodiment is that the setting of the 2h pressure holding time can effectively increase the diffusion welding effect.

[0131] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements easily thought of by those skilled in the art within the technical range disclosed by the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A gas pressurized coil plate forming method characterized by, The method comprises the following steps: Preparation of the pre-plate, processing the base plate (1) and the runner plate (4), and opening the runner groove (5) on the runner plate (4), spraying the flux on the non-diffusion area (6) of the runner plate (4), and sealing the runner plate (4) and the base plate (1) by argon arc welding to form the pre-plate; Layered die assembly, preparation of the air bag, and assembly of the pre-plate and the air bag in the mold from bottom to top; Pre-plate heating, heating the pre-plate to a preset temperature; Air bag pressurization and loading, filling the welding protective gas into the air bag to a first preset pressure, maintaining the pressure for a first preset time, and then releasing the pressure to a second preset pressure and maintaining the pressure; Pre-plate pressurization and back blowing, filling the welding protective gas into the runner groove (5) of the pre-plate to a third preset pressure, maintaining the pressure for a second preset time, and then releasing the pressure of the pre-plate to a fourth preset pressure and maintaining the pressure; Inspection of the pre-plate; Mechanical processing, mechanical processing of the pre-plate to form the coil plate.

2. The gas pressurized coil plate forming method according to claim 1, characterized by, The pre-plate heating to a preset temperature comprises: Vacuumizing the pre-plate and the air bag; Heating the temperature of the pre-plate to between 920℃ and 940℃ at a first preset speed.

3. The gas pressurized coil plate forming method according to claim 1, characterized by, The welding protective gas is filled into the air bag to a first preset pressure, which comprises: Filling the welding protective gas into the air bag to pressurize to 1MPa at a second preset speed, maintaining the pressure for a first preset time; Filling the welding protective gas into the air bag to pressurize to 1.5MPa at a third preset speed, maintaining the pressure for a second preset time; Filling the welding protective gas into the air bag to pressurize to 1.8MPa at a fourth preset speed, maintaining the pressure for a third preset time; Filling the welding protective gas into the air bag to pressurize to 2MPa at a fifth preset speed.

4. The gas pressurized coil plate forming method according to claim 1, characterized by, The welding protective gas is filled into the runner groove (5) of the pre-plate to a third preset pressure, which comprises: Filling the welding protective gas into the runner groove (5) of the pre-plate to pressurize to 1MPa at a sixth preset speed.

5. The gas pressurized coil plate forming method according to claim 1, wherein Before the preparation of the air bag, the vacuum pipeline (3) is welded at the outlet of the runner groove (5).

6. The gas pressurized coil plate forming method according to claim 1, wherein The air bag comprises a backing plate (9), a support strip (10), and a sealing plate (8), the support strip (10) is installed between the sealing plate (8) and the backing plate (9), and the support strip (10) is provided with air holes (11).

7. The gas pressurized coil plate forming method according to claim 6, wherein The air bag further comprises a gas filling pipeline (7), which is inserted into the air holes (11).

8. The gas pressurized coil plate forming method according to claim 7, wherein The preparation of the air bag comprises: Spraying the flux on the contact surface between the support strip (10) and the backing plate (9) and the contact surface between the support strip (10) and the sealing plate (8); Sealing the support strip (10) and the sealing plate (8) and the support strip (10) and the backing plate (9) by argon arc welding; Butt joining the gas filling pipeline (7) at the air holes (11) and welding the sealing plate (8), the backing plate (9), and the support strip (10).

9. The gas pressurized coil plate forming method according to claim 1, wherein The inspection of the pre-plate comprises: Drilling holes on the non-diffusion area (6) of the runner plate (4) as detection points; Filling the inert gas into the pre-plate to test the pressure-bearing performance of the pre-plate.

10. The gas pressurized coil plate forming method according to claim 1, characterized by, The first preset time is 2h, the second preset pressure is 0.1MPa, the second preset time is 2h, and the fourth preset pressure is 0.1MPa.

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